Conceptual Structures: Broadening the Base 9th International Conference on Conceptual Structures, ICCS 2001, Stanford, CA, USA, July 30-August 3, 2001, Proceedings - Delugach, Harry S.; Delugach, Harry S.; Stumme, Gerd; Stumme, Gerd (Springer Berlin Heidelberg : Imprint: Springer, 2001)